test: use local times for tests (#1354)

This change allows unit tests that don't set a timezone to refer to the local time.

Closes #1353

test/workers/branch/schedule.spec.js

@@ -78,7 +78,7 @@ describe('workers/branch/schedule', () => {
   describe('isScheduledNow(config)', () => {
     let config;
     beforeEach(() => {
-      mockDate.set(1498812608678); // 2017-06-30 10:50am
+      mockDate.set('2017-06-30T10:50:00.000'); // Locally 2017-06-30 10:50am
       jest.resetAllMocks();
       config = {};
     });
@@ -114,6 +114,7 @@ describe('workers/branch/schedule', () => {
     it('supports timezone', () => {
       config.schedule = ['after 4:00pm'];
       config.timezone = 'Asia/Singapore';
+      mockDate.set('2017-06-30T10:50:00.000Z'); // Globally 2017-06-30 10:50am
       const res = schedule.isScheduledNow(config);
       expect(res).toBe(true);
     });
@@ -159,7 +160,7 @@ describe('workers/branch/schedule', () => {
     });
     it('approves first day of the month', () => {
       config.schedule = ['before 11am on the first day of the month'];
-      mockDate.set(1506835566000); // Sunday, 1 October 2017 05:26:06
+      mockDate.set('2017-10-01T05:26:06.000'); // Locally Sunday, 1 October 2017 05:26:06
       const res = schedule.isScheduledNow(config);
       expect(res).toBe(true);
     });